How Often Should You Deworm a Horse Based on Risk Level

Not all horses with the same age need the same schedule.

Low-risk horses

• Minimal herd size
• Clean pasture management
• Consistently low fecal egg counts
  These horses may only need annual or twice-yearly treatment.

Moderate-risk horses

• Shared pastures
• Boarding barns
• Occasional travel
  Often require targeted treatments based on testing.

High-risk horses

• High fecal egg counts
• Crowded environments
• Frequent new arrivals
  May need more frequent, vet-guided deworming.

Seasonal Horse Deworming Schedule in the U.S.

Most targeted programs focus on seasonal timing, not monthly dosing.

• Spring: Address strongyles before peak grazing
• Summer: Often no deworming unless tests indicate need
• Fall: Treat bots and encysted larvae when appropriate
• Winter: Minimal activity in colder regions; climate-dependent